Reddit bans several of its most racist communities - The Verge

"Today, in addition to applying quarantines, we are banning a handful of communities that exist solely to annoy other Redditors, prevent us from improving Reddit, and generally make Reddit worse for everyone else," Huffman wrote. "Our most important policy over the last 10 years has been to allow just about anything so long as it does not prevent others from enjoying Reddit for what it is: the best place online to have truly authentic conversations."

Reddit still plans to quarantine other parts of its site, but it's not clear yet which subreddits will be affected; Huffman only noted that moderators of those subreddits would receive a message. There are, however, some more details about how the system will work. Reddit says communities will be quarantined when administrators "deem its content to be extremely offensive or upsetting to the average Redditor." Reddit users will need to have an account with a verified email address to gain access, and will need to explicitly opt in to view them. Additionally, the site will prohibit quarantined communities from displaying custom banners.